CN114284026B - Metal-enclosed liquid nitrogen insulating superconducting line - Google Patents
Metal-enclosed liquid nitrogen insulating superconducting line Download PDFInfo
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- CN114284026B CN114284026B CN202111568436.7A CN202111568436A CN114284026B CN 114284026 B CN114284026 B CN 114284026B CN 202111568436 A CN202111568436 A CN 202111568436A CN 114284026 B CN114284026 B CN 114284026B
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- phase
- superconductor
- phase hollow
- liquid nitrogen
- hollow superconductor
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000007788 liquid Substances 0.000 title claims abstract description 39
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 38
- 239000002887 superconductor Substances 0.000 claims abstract description 97
- 238000009413 insulation Methods 0.000 claims abstract description 27
- 239000012212 insulator Substances 0.000 claims abstract description 15
- 239000010963 304 stainless steel Substances 0.000 claims description 5
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 3
- 235000019362 perlite Nutrition 0.000 claims description 3
- 239000010451 perlite Substances 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 239000004020 conductor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Containers, Films, And Cooling For Superconductive Devices (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
The invention discloses a metal-enclosed liquid nitrogen insulating superconducting line, which comprises: an insulating cylinder with a three-phase hollow superconductor inside; basin-type insulators which are arranged at two ends of the insulating cylinder and are connected with the three-phase hollow superconductors; the three-phase hollow superconductor comprises an A-phase hollow superconductor, a B-phase hollow superconductor and a C-phase hollow superconductor; gaps with preset lengths are formed among the A-phase hollow superconductor, the B-phase hollow superconductor and the C-phase hollow superconductor and between the three-phase hollow superconductor and the wall of the insulating cylinder, and the gaps are filled with liquid nitrogen; the A-phase hollow superconductor, the B-phase hollow superconductor and the C-phase hollow superconductor comprise guide sections, connecting flanges, corrugated sections and cylindrical sections which are coaxially arranged in sequence from front to back, wherein the guide sections are connected with corresponding conductive seats on the basin-type insulator and move back and forth in liquid nitrogen relative to the conductive seats. The invention can effectively meet the insulation requirement during three-phase alternating current transmission.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a metal-enclosed liquid nitrogen insulating superconducting line.
Background
The superconductor is a conductor with zero resistance characteristic at critical temperature, can reduce resistance loss during electric energy transmission, and can be soaked in liquid nitrogen to show superconducting characteristic when working at 77 k. Because the requirements of working environment are strict, the superconductor needs to realize the functions of electric connection, interphase insulation, low-temperature maintenance and the like at the same time when the superconductor is used for power transmission, and particularly, the insulation problem is more remarkable when three-phase alternating current power transmission is carried out, and a special structure is needed to simultaneously meet the requirements.
Disclosure of Invention
The invention aims to solve the technical problem of providing a metal-enclosed liquid nitrogen insulating superconducting line so as to meet the insulating requirement during three-phase alternating current transmission.
In order to solve the technical problems, the invention provides a metal-enclosed liquid nitrogen insulating superconducting line, which comprises:
a heat insulating cylinder internally provided with a three-phase hollow superconductor;
basin-type insulators which are arranged at two ends of the heat insulation cylinder and are connected with the three-phase hollow superconductors;
the three-phase hollow superconductor comprises an A-phase hollow superconductor, a B-phase hollow superconductor and a C-phase hollow superconductor; gaps with preset lengths are formed among the A-phase hollow superconductor, the B-phase hollow superconductor and the C-phase hollow superconductor and between the three-phase hollow superconductor and the wall of the heat insulation cylinder, and the gaps are filled with liquid nitrogen;
the A-phase hollow superconductor, the B-phase hollow superconductor and the C-phase hollow superconductor comprise guide sections, connecting flanges, corrugated sections and cylindrical sections which are coaxially arranged in sequence from front to back, wherein the guide sections are connected with corresponding conductive seats on the basin-type insulator and move back and forth in liquid nitrogen relative to the conductive seats.
Further, the heat insulation cylinder comprises a cylinder body and mounting flanges arranged at two ends of the cylinder body, wherein a sandwich structure used for heat insulation is formed between the cylinder body and the mounting flanges, and heat insulation perlite is filled in the sandwich structure and vacuumized.
Further, the gap of the predetermined length is at least 50mm.
Further, the A-phase hollow superconductor, the B-phase hollow superconductor and the C-phase hollow superconductor all comprise superconducting tapes wound on the corrugated section and the cylindrical section by adopting leads of 400 mm.
Further, the superconducting tape and the connecting flange are connected by soldering.
Further, the corrugated section is extruded at the end of the cylindrical section, and the corrugated section is used for providing deformation compensation during operation and installation of the three-phase hollow superconductor.
Further, the guide section is welded at the front end of the corrugated section, and when the cylindrical section contracts after liquid nitrogen is filled, the guide section moves back and forth in the conductive seat so as to keep the whole three-phase hollow superconductor stable and generate no internal stress.
Further, the corrugated section and the cylindrical section are made of 304 stainless steel pipes with the inner diameter of 96mm and the outer diameter of 100 mm.
Further, the basin-type insulator comprises an A-phase conductive seat, a B-phase conductive seat and a C-phase conductive seat, and guide sections of the A-phase hollow superconductor, the B-phase hollow superconductor and the C-phase hollow superconductor are respectively inserted into the A-phase conductive seat, the B-phase conductive seat and the C-phase conductive seat.
Further, the superconducting tapes are second-generation superconducting tapes with the width of 3mm and the thickness of 0.8mm, and 16 superconducting tapes are used in total.
The implementation of the invention has the following beneficial effects: by arranging the heat insulation cylinder filled with liquid nitrogen in the three-phase hollow superconductor, the three-phase hollow superconductor is suspended in the liquid nitrogen, and the whole body can be kept free from being obviously bent due to gravity without additional support; the heat insulation cylinder realizes heat insulation through a sandwich structure; gaps with preset lengths are kept between the hollow superconductors of all phases and the wall of the heat insulation cylinder, so that the insulation performance can be ensured; the guide section, the connecting flange, the corrugated section and the cylindrical section are coaxially arranged in sequence from front to back, and when the cylindrical section is contracted greatly in liquid nitrogen, the guide section can move back and forth in the conductive seat so as to keep the whole conductor stable and avoid internal stress. In addition, the full-metal shell is suitable for laying in various environments, and has the rated voltage of 10kV and the rated current of 2000A.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an assembly structure of a metal-enclosed liquid nitrogen insulated superconducting line according to an embodiment of the present invention.
Fig. 2 is a schematic diagram showing an assembly structure of a three-phase hollow superconductor and a bowl insulator according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a three-dimensional exploded structure of a metal-enclosed liquid nitrogen insulated superconducting line according to an embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view of a heat insulating cylinder in an embodiment of the invention.
Fig. 5 is a schematic diagram showing an assembly structure of an end portion of a three-phase hollow superconductor and a bowl insulator according to an embodiment of the present invention.
Fig. 6 is a schematic perspective view of a hollow superconductor in an embodiment of the invention.
Fig. 7 is a schematic cross-sectional view of a hollow superconductor in an embodiment of the invention.
Fig. 8 is a schematic perspective view of a basin-type insulator according to an embodiment of the present invention.
Detailed Description
The following description of embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. The terms of direction and position in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer only to the direction or position of the drawing. Accordingly, directional and positional terms are used to illustrate and understand the invention and are not intended to limit the scope of the invention.
Referring to fig. 1-3, an embodiment of the present invention provides a metal enclosed liquid nitrogen insulated superconducting line, including:
a heat insulating cylinder 1 with a three-phase hollow superconductor 2 built therein;
basin-type insulators 3 which are arranged at two ends of the heat insulation cylinder 1 and are connected with the three-phase hollow superconductor 2;
the three-phase hollow superconductor 2 includes an a-phase hollow superconductor 21, a B-phase hollow superconductor 22, and a C-phase hollow superconductor 23; gaps with preset lengths are formed among the A-phase hollow superconductor 21, the B-phase hollow superconductor 22 and the C-phase hollow superconductor 23 and between the three-phase hollow superconductor 2 and the cylinder wall of the heat insulation cylinder 1, and the gaps are filled with liquid nitrogen;
the A-phase hollow superconductor 21, the B-phase hollow superconductor 22 and the C-phase hollow superconductor 23 comprise a guide section 214, a connecting flange 213, a corrugated section 211 and a cylindrical section 212 which are coaxially arranged from front to back in sequence, wherein the guide section 214 is connected with a corresponding conductive seat on the basin-type insulator 3 and moves back and forth in liquid nitrogen relative to the conductive seat.
Specifically, referring to fig. 4-8, the heat insulating cylinder 1 is made of 304 stainless steel, and comprises a cylinder 11 and mounting flanges 12 arranged at two ends of the cylinder 11, and is filled with liquid nitrogen with a temperature below 77k during operation. The cylinder 11 and the mounting flange 12 are both formed with a sandwich structure 10 for heat insulation, and the sandwich structure 10 is filled with heat insulation perlite and vacuumized to ensure the heat insulation performance. As an example, the total length of the cylinder 11 is 15m.
The total mass of the three-phase hollow superconductor 2 is 87kg, the total buoyancy in liquid nitrogen is 91kg, the three-phase hollow superconductor can be in a suspension state in liquid nitrogen, and the whole body can be kept free from being obviously bent due to gravity without additional support. Gaps of more than 50mm are kept among the A-phase hollow superconductor 21, the B-phase hollow superconductor 22 and the C-phase hollow superconductor 23 and between the three-phase hollow superconductor 2 and the wall of the heat insulation cylinder 1, and liquid nitrogen is filled in the gaps during operation, so that the insulating performance can be ensured.
The structures of the a-phase hollow superconductor 21, the B-phase hollow superconductor 22, and the C-phase hollow superconductor 23 are the same, and the structure of the a-phase hollow superconductor 21 will be described below by way of example with reference to fig. 6 and 7. The a-phase hollow superconductor 21 includes a guide section 214, a connection flange 213, a corrugated section 211 and a cylindrical section 212 coaxially arranged in this order from front to back, the outer surfaces of the corrugated section 211 and the cylindrical section 212 are wound with a superconducting tape 210, the superconducting tape 210 is a second generation superconducting tape having a width of 3mm and a thickness of 0.8mm, 16 in this embodiment, each having a critical current of 200A, and exhibiting a superconducting state at a temperature of 77k or less; the superconducting tape 210 was wound around the corrugated section 211 and the cylindrical section 212 with a lead of 400mm, and was connected to the connection flange 213 by soldering. The connection flange 213 is formed by processing a 20mm thick copper plate, and is provided with 4 through holes with the diameter of 10mm for connecting the connection flange 213 with the conductive seat of the basin-type insulator 3. The corrugated section 211 and the cylindrical section 212 are made of 304 stainless steel pipes with inner diameters of 96mm and outer diameters of 100mm, and the corrugated section 211 is extruded at the end of the cylindrical section. The purpose of the corrugated section 211 is to provide compensation for deformation of the hollow superconductor during operation and installation, preventing deformation of other parts. The guide section 214 is made of 304 stainless steel and welded to the front end of the corrugated section 211. The connecting flange 213 is in non-mechanical connection with the guide section 214 and the corrugated section 211 and can move relatively; when the liquid nitrogen is filled, the cylindrical section 212 is greatly contracted, and the guide section 214 can move back and forth in the conductive seat so as to keep the whole conductor stable and generate no internal stress.
The basin-type insulator 3 comprises an A-phase conductive seat 31, a B-phase conductive seat 32 and a C-phase conductive seat 33, wherein the guide sections of the A-phase hollow superconductor 21, the B-phase hollow superconductor 22 and the C-phase hollow superconductor 23 are respectively inserted into the A-phase conductive seat 31, the B-phase conductive seat 32 and the C-phase conductive seat 33, and then the connecting flanges of the hollow superconductors of all phases are assembled with the conductive seats of all phases.
As can be seen from the above description, compared with the prior art, the implementation of the invention has the following beneficial effects: by arranging the heat insulation cylinder filled with liquid nitrogen in the three-phase hollow superconductor, the three-phase hollow superconductor is suspended in the liquid nitrogen, and the whole body can be kept free from being obviously bent due to gravity without additional support; the heat insulation cylinder realizes heat insulation through a sandwich structure; gaps with preset lengths are kept between the hollow superconductors of all phases and the wall of the heat insulation cylinder, so that the insulation performance can be ensured; the guide section, the connecting flange, the corrugated section and the cylindrical section are coaxially arranged in sequence from front to back, and when the cylindrical section is contracted greatly in liquid nitrogen, the guide section can move back and forth in the conductive seat so as to keep the whole conductor stable and avoid internal stress. In addition, the full-metal shell is suitable for laying in various environments, and has the rated voltage of 10kV and the rated current of 2000A.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (8)
1. A metal-enclosed liquid nitrogen insulated superconducting line, comprising:
a heat insulating cylinder internally provided with a three-phase hollow superconductor;
basin-type insulators which are arranged at two ends of the heat insulation cylinder and are connected with the three-phase hollow superconductors;
the three-phase hollow superconductor comprises an A-phase hollow superconductor, a B-phase hollow superconductor and a C-phase hollow superconductor; gaps with preset lengths are formed among the A-phase hollow superconductor, the B-phase hollow superconductor and the C-phase hollow superconductor and between the three-phase hollow superconductor and the wall of the heat insulation cylinder, and the gaps are filled with liquid nitrogen;
the A-phase hollow superconductor, the B-phase hollow superconductor and the C-phase hollow superconductor comprise guide sections, connecting flanges, corrugated sections and cylindrical sections which are coaxially arranged in sequence from front to back, wherein the guide sections are connected with corresponding conductive seats on the basin-type insulator and move back and forth in liquid nitrogen relative to the conductive seats;
the A-phase hollow superconductor, the B-phase hollow superconductor and the C-phase hollow superconductor all comprise superconducting tapes wound on the corrugated section and the cylindrical section; the superconducting strip is connected with the connecting flange by soldering;
the guide section is welded at the front end of the corrugated section, when the cylindrical section contracts after liquid nitrogen is filled, the guide section moves back and forth in the conductive seat so as to keep the whole three-phase hollow superconductor stable and generate no internal stress.
2. The metal-enclosed liquid nitrogen insulated superconducting circuit according to claim 1, wherein the heat-insulating cylinder comprises a cylinder body and mounting flanges arranged at two ends of the cylinder body, the cylinder body and the mounting flanges are both formed with a sandwich structure for heat insulation, and the sandwich structure is filled with heat-insulating perlite and vacuumized.
3. The metallic closed liquid nitrogen insulated superconducting wire of claim 1, wherein the gap of the predetermined length is at least 50mm.
4. The metallic closed liquid nitrogen insulated superconducting wire of claim 1, wherein said superconducting tape is wound on said corrugated section and cylindrical section with a lead of 400 mm.
5. The metallic closed liquid nitrogen insulated superconducting wire according to claim 1, wherein the corrugated section is extruded at an end of the cylindrical section, the corrugated section being used to provide compensation for deformation of the three-phase hollow superconductor during operation and installation.
6. The metallic closed liquid nitrogen insulated superconducting circuit of claim 1, wherein the corrugated section and the cylindrical section are made of 304 stainless steel pipe with an inner diameter of 96mm and an outer diameter of 100 mm.
7. The metallic closed liquid nitrogen insulated superconducting line according to claim 1, wherein the basin-type insulator comprises an a-phase conductive seat, a B-phase conductive seat and a C-phase conductive seat, and the guide sections of the a-phase hollow superconductor, the B-phase hollow superconductor and the C-phase hollow superconductor are respectively inserted into the a-phase conductive seat, the B-phase conductive seat and the C-phase conductive seat.
8. The metal-enclosed liquid nitrogen-insulated superconducting wire according to claim 4, wherein the superconducting tapes are second-generation superconducting tapes with a width of 3mm and a thickness of 0.8mm, and 16 superconducting tapes are used in total.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111568436.7A CN114284026B (en) | 2021-12-21 | 2021-12-21 | Metal-enclosed liquid nitrogen insulating superconducting line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111568436.7A CN114284026B (en) | 2021-12-21 | 2021-12-21 | Metal-enclosed liquid nitrogen insulating superconducting line |
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| Publication Number | Publication Date |
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| CN114284026A CN114284026A (en) | 2022-04-05 |
| CN114284026B true CN114284026B (en) | 2024-04-05 |
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| CN202111568436.7A Active CN114284026B (en) | 2021-12-21 | 2021-12-21 | Metal-enclosed liquid nitrogen insulating superconducting line |
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| CN114334269B (en) * | 2021-12-30 | 2023-10-20 | 深圳供电局有限公司 | Air sleeve for superconducting combined electric appliance |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0285147A2 (en) * | 1987-03-31 | 1988-10-05 | Sumitomo Electric Industries Limited | Current-carrying lead |
| JPH08273922A (en) * | 1995-03-30 | 1996-10-18 | Toshiba Corp | Oxide superconducting current lead and superconducting magnet device |
| US6262375B1 (en) * | 1992-09-24 | 2001-07-17 | Electric Power Research Institute, Inc. | Room temperature dielectric HTSC cable |
| CA2484186A1 (en) * | 2003-10-15 | 2005-04-15 | Nexans | Superconducting current limiting device with magnetic field assisted quenching |
| CN104682024A (en) * | 2015-03-05 | 2015-06-03 | 清华大学 | Multi-segment connecting device for double-current-channel high temperature superconducting cable |
| CN107068329A (en) * | 2017-03-23 | 2017-08-18 | 杭州图锐科技有限公司 | A kind of extension type magnetizes current lead device and its application method |
| WO2019146269A1 (en) * | 2018-01-23 | 2019-08-01 | 住友電気工業株式会社 | Superconductive cable |
| CN114300197A (en) * | 2022-01-06 | 2022-04-08 | 华北电力大学 | Compact structure type high-temperature superconducting three-phase alternating current cable |
-
2021
- 2021-12-21 CN CN202111568436.7A patent/CN114284026B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0285147A2 (en) * | 1987-03-31 | 1988-10-05 | Sumitomo Electric Industries Limited | Current-carrying lead |
| US6262375B1 (en) * | 1992-09-24 | 2001-07-17 | Electric Power Research Institute, Inc. | Room temperature dielectric HTSC cable |
| JPH08273922A (en) * | 1995-03-30 | 1996-10-18 | Toshiba Corp | Oxide superconducting current lead and superconducting magnet device |
| CA2484186A1 (en) * | 2003-10-15 | 2005-04-15 | Nexans | Superconducting current limiting device with magnetic field assisted quenching |
| CN104682024A (en) * | 2015-03-05 | 2015-06-03 | 清华大学 | Multi-segment connecting device for double-current-channel high temperature superconducting cable |
| CN107068329A (en) * | 2017-03-23 | 2017-08-18 | 杭州图锐科技有限公司 | A kind of extension type magnetizes current lead device and its application method |
| WO2019146269A1 (en) * | 2018-01-23 | 2019-08-01 | 住友電気工業株式会社 | Superconductive cable |
| CN114300197A (en) * | 2022-01-06 | 2022-04-08 | 华北电力大学 | Compact structure type high-temperature superconducting three-phase alternating current cable |
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